Saw-straining mechanism.



c. L CLEVELAND. SAW STRAINI-N G MEGHANISM. APPLICATION FILED' DEO. 27,19Q6. 919, 128 Patented .Ai-12u20, 1909.

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APPLICATION FILED DBO. 27, 1906.

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C. E. CLEVELAND. SAW STRAINING MECHANISM. y vAPPLIGATION FILmnEo.27,19oe. l 9,1 9, 128, Patented Apr. 20, 1909.

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UNITED -sTATEs PATENT oEEioE.

CHARLES E.-CLEVELAND, O FOND DU LAC, WISCONSIN.

saw-STRAINING MECHANISM.

To all, wle-0m it may concern.'

lle it known that I, CHARLES E. CLEvE- nino, a citizen of the UnitedStates, residing at Fond du Lac, iii the county of Fond du Lac. andState of Wisconsin, have invented `certain new and useful Improveinelitsin Saw- Straining Mechanism, of which the following is a specification.y

My present invention pertains to improvements in saw-strainingmechanism, the construction and advantages of which will be hereinafterset forth, reference being had to the annexed drawings, wherein:

Figurel is a vertical sectional view of so uiuc-h of a band saw-mill asis necessary to u proper illustration' of my invention; Fig. 2 a rearelevationlot the mill, the lever which sustains tliestraining weightbeing shown as broken oit; `Fig. 3 a transverse vertical' sectional viewon Athe line 3-3 ot Fig. l; Fig. 4t a horizontal sectional view on theline 4 1 of Fig.,1; Fig. 5 a perspective view of one 'of the knife-edgesustainingl rods; Fig.A 6 arperspect-ive view of one of the sustaininglevers; and Fig. 7 'a like view of the rocker-shaft which coacts withthe knifeedge rods to tfiipport the vertically-slidi g supports or-pdestals that carry bearin bones for the shaft of the upper band-Wheel.'lhe object of the present 'applicationis to provide a simple andeiiicient saw-straining inecharlisinpwhich as a whole may be raised orlowered to adjust the wheels toward or from each other for theaccommodation of saws of dierent lengths and in which the strain isapplied directly to the saw after the saine has een positioned.

Referring to the drawings, A denotes the traine of the mill, providedwith two hollow vertical columns B and C, in which are mounted thesliding pedestals D that carry the boxes E for the upper band-wheelshaft l". This is of the ordinary construction. The lower end of each ofthepedestals l) is cored out or hollowed, and bearing-blocks G giremounted therein.

.li denotes a rocker-shaft, provided upon its upper and lower faces withrecesses, those ,iu th/e upper face forming seats or bearings 'tor theknife-edges formed upon the lower f-nds oit the rods l, the upper end ofeach ot said rods being rounded seated in a recess formed in each o theblocks (l. llxtending' into each of the recesses in the lower tace ofthe rocker-shaft is a knife-edge formed Iupon the upper end of one ofthe sustain- Speccaton of Letters Patent.

.A l, Application led December 27, 1908. Serial No. 849,705.

Patented April 2o, 190e.

ing rods or members J, best shown in Fig. 5, the lower ends of said rodspassing through openings K'fornied in the frame of dthe mill, see Fig.l. Each of said sustaining inembers is provided with a pair oflaterallyi `extending lugs L which rest in curved seats @d formed in theforked ends of levers N, there being two of such levers, see4 Fig. 4:.Said levers are tulcrumed upon shafts O,

lthe rear eiids of the levers extending out through openings foi'ined'inthe rear face ot thevertical columns and likewise being forked.

' P denotesl a shaft, mounted in suitable bearings formed in'the frameof the mill,-

said shaft 'being provided with a pair of spools Q., standing in line,respectively', with the rear ends of the levers N and at a pointsomewhat below said levers.

In the outer or rear end .of each of.. the levers N is mounted aswivel-block R through which extends a stem S, the upper portion ofwhich is threaded and Aupon which -is a nut T.` To the lower end of thestem S is secured a coupling member U which in turn is connected. to theupper' end of a cable or rope V, the lower end of each of said cablesbeing "connected to the spoolsQf which stand immediately below therearends of the levers N, as above noted.

To one end ot the shaft P is secured a drum NV, provided with aratchet-wheel X.)

A pawl Y, pivoted to the frame of the mll.- V-

coacts with said ratchet-wheel and serves to' hold the drinn and theshaftv in their ad!" justed positions. A. cable Z is secured to the drumand a weight. A is attached to the` 'lower Iend of said cable, thearrangen'ient being suoli that th'e weight, acting through the weight ofthe upper band-wheel and its allied parts.

.95 shaft l and levers N, counterbalances the In order to effectadjustment of the shaft l and consequently to raise or lower the up- Vprovidedz willi a hand-wheel B by which said Shaftpei' band-wheel shaft,shaft P is may be rotated to raise or lower, the savvstraiuing mechanismas may he necessary.

lilxtending' outwardly from the rockershatt i-i and rigidly attixedthereto is an arm or lever tl carrying atits outer end an ad- Ijiu-table weight D. rlhis weight, acting throuo'h the lever. and therocker-shaft r l i serves lo place the necessary tension upon the sau'to keep the same properly strained :u all times. lt is designed to havethis lever llO stuud in :i substantially horizontal piene when the sewupon the wheels, and this may be done by throwingl the pswl Y out ofengagement with the ratchet and rotating the shiit't l) to rnise orlower the levers N and Vconsequently raise or lower the perle-,stillsand the 'upper shaft supported thereby, accord ine' :is :i longer oishorter snw is employed.

it will be noted that' the strain upon. the suwis applied (tireetythrough the roeltershult by the weight D und the lever C', and thut theweigg'ht ind the parts upon which it nets, with the puwl, serre merelyto counterlmlunfe the meetiunisin und to render :idliustnieiit thereoljt'or longer or .shorter sziws in easy nmtter.

sliziit in the manner shown in Figs. l and Y, I that is to soy, haringthe knife-edges oi the upper and lower members out ot' ulineinent undthe weight D acting to draw them into olinement, the parts in eiii'ectbecome a toggle, which `is eonstiintly tending to straighten out andthereby exert zin upward thrust upon the pedestsils l) :1nd as uconsequence to riiise the shaft F and place the sow under tension orstrain.

Shaft P and its spools Q may t'or the stilte ot' convenience in theclaims be termed :i windlziss.

' hiring thus described my invention, what l claim is:

l. In zi bandenw n'iill, the combination oit the upper wheel shaft;vertically movable supports therefor; e rocker-shaft having seats inits-upper and lower trices., said seats beingv out overticnl alinement;rods interposed between the upper seats und the vertienl supports; npair ot sustaining members having their upper endsl loezited in theseats in the lower face of the rocker-shaft; a lever t'or supportingeach of said sustaining ineinbers; i1 windlnss; cables extending* from,the

outer ends ot the levers to the wiiidle. and :i weight sei-ring;- torotate the rocker-shaft.

l i t i2, ln :i band-saw inill, the combination of the upper wheelshaft; vertienllysniovable supports therefor; a"rocker-shtift having,r aplurality ot' seuts .t'orined in its upper and lower trices, said seatsbeingout of alineinent; rods interposed between the movable supportsvsind the seats in the upper face of the roeker-shait, the lower ends ofthe rods being,` provided with knife-edge bearings; sustaining membershaving' knife-edges upon their upper ends whieh take in the mts in theunder 'trice ot the welter-shaft; a sup` porting` lever tor inch of saidmembers; zi

y windlziss for .rocking said levers to secure iniy tial adjustment ofthe parts; a counterbtilj :turing weight itior the ly forming therecesses in the 'rockenl windliies; :ind i weight meting; to rotate theroCkershQi-"t and to thereby place the sziw under tension.

5. ln :i bund-sow mill, the Combination of the upper wheel shzijtt;'vertieiilly-moi'able .supports therefor; n rocker-shaft having nplurality ot' seats formed in its upper and lower trices, the seatsstanding` out of Vertical alineinent; i pair of sustaining membersharingimite-edges upon their upper ends which pass into the seats in theunder ffice of the rocker-shaft, the lower ends of seid sus tainingmembers passing through openings toi-med in the treme of the mill; npair of lugs extending outwardly from eaclrsusta-ining` member; :i leverengaging each pair of lugs; a windlnss; i cable connectingeach leverwith the windluss; uy eounterbzilzinein weight :toting on the. windlass;n looking device tor the windlfiss; ai lever extending ontwuidly tromthe rocker-shaft; and weight `will/i t ii esses.

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